irqchip: atmel-aic: Add atmel AIC/AIC5 drivers
Add AIC (Advanced Interrupt Controller) and AIC5 (AIC5 is an evolution of
the AIC block) drivers.
Put common code in irq-atmel-aic-common.c/.h so that both driver can access
shared functions (this will ease maintenance).
These drivers are only compatible with dt enabled board and replace the
old implementation found in arch/arm/mach-at91/irq.c.
Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Link: https://lkml.kernel.org/r/1405012462-766-4-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c
new file mode 100644
index 0000000..b15b566
--- /dev/null
+++ b/drivers/irqchip/irq-atmel-aic.c
@@ -0,0 +1,247 @@
+/*
+ * Atmel AT91 AIC (Advanced Interrupt Controller) driver
+ *
+ * Copyright (C) 2004 SAN People
+ * Copyright (C) 2004 ATMEL
+ * Copyright (C) Rick Bronson
+ * Copyright (C) 2014 Free Electrons
+ *
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/bitmap.h>
+#include <linux/types.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <asm/exception.h>
+#include <asm/mach/irq.h>
+
+#include "irq-atmel-aic-common.h"
+#include "irqchip.h"
+
+/* Number of irq lines managed by AIC */
+#define NR_AIC_IRQS 32
+
+#define AT91_AIC_SMR(n) ((n) * 4)
+
+#define AT91_AIC_SVR(n) (0x80 + ((n) * 4))
+#define AT91_AIC_IVR 0x100
+#define AT91_AIC_FVR 0x104
+#define AT91_AIC_ISR 0x108
+
+#define AT91_AIC_IPR 0x10c
+#define AT91_AIC_IMR 0x110
+#define AT91_AIC_CISR 0x114
+
+#define AT91_AIC_IECR 0x120
+#define AT91_AIC_IDCR 0x124
+#define AT91_AIC_ICCR 0x128
+#define AT91_AIC_ISCR 0x12c
+#define AT91_AIC_EOICR 0x130
+#define AT91_AIC_SPU 0x134
+#define AT91_AIC_DCR 0x138
+
+static struct irq_domain *aic_domain;
+
+static asmlinkage void __exception_irq_entry
+aic_handle(struct pt_regs *regs)
+{
+ struct irq_domain_chip_generic *dgc = aic_domain->gc;
+ struct irq_chip_generic *gc = dgc->gc[0];
+ u32 irqnr;
+ u32 irqstat;
+
+ irqnr = irq_reg_readl(gc->reg_base + AT91_AIC_IVR);
+ irqstat = irq_reg_readl(gc->reg_base + AT91_AIC_ISR);
+
+ irqnr = irq_find_mapping(aic_domain, irqnr);
+
+ if (!irqstat)
+ irq_reg_writel(0, gc->reg_base + AT91_AIC_EOICR);
+ else
+ handle_IRQ(irqnr, regs);
+}
+
+static int aic_retrigger(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+
+ /* Enable interrupt on AIC5 */
+ irq_gc_lock(gc);
+ irq_reg_writel(d->mask, gc->reg_base + AT91_AIC_ISCR);
+ irq_gc_unlock(gc);
+
+ return 0;
+}
+
+static int aic_set_type(struct irq_data *d, unsigned type)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ unsigned int smr;
+ int ret;
+
+ smr = irq_reg_readl(gc->reg_base + AT91_AIC_SMR(d->hwirq));
+ ret = aic_common_set_type(d, type, &smr);
+ if (ret)
+ return ret;
+
+ irq_reg_writel(smr, gc->reg_base + AT91_AIC_SMR(d->hwirq));
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static void aic_suspend(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+
+ irq_gc_lock(gc);
+ irq_reg_writel(gc->mask_cache, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(gc->wake_active, gc->reg_base + AT91_AIC_IECR);
+ irq_gc_unlock(gc);
+}
+
+static void aic_resume(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+
+ irq_gc_lock(gc);
+ irq_reg_writel(gc->wake_active, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(gc->mask_cache, gc->reg_base + AT91_AIC_IECR);
+ irq_gc_unlock(gc);
+}
+
+static void aic_pm_shutdown(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+
+ irq_gc_lock(gc);
+ irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC_ICCR);
+ irq_gc_unlock(gc);
+}
+#else
+#define aic_suspend NULL
+#define aic_resume NULL
+#define aic_pm_shutdown NULL
+#endif /* CONFIG_PM */
+
+static void __init aic_hw_init(struct irq_domain *domain)
+{
+ struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
+ int i;
+
+ /*
+ * Perform 8 End Of Interrupt Command to make sure AIC
+ * will not Lock out nIRQ
+ */
+ for (i = 0; i < 8; i++)
+ irq_reg_writel(0, gc->reg_base + AT91_AIC_EOICR);
+
+ /*
+ * Spurious Interrupt ID in Spurious Vector Register.
+ * When there is no current interrupt, the IRQ Vector Register
+ * reads the value stored in AIC_SPU
+ */
+ irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC_SPU);
+
+ /* No debugging in AIC: Debug (Protect) Control Register */
+ irq_reg_writel(0, gc->reg_base + AT91_AIC_DCR);
+
+ /* Disable and clear all interrupts initially */
+ irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC_ICCR);
+
+ for (i = 0; i < 32; i++)
+ irq_reg_writel(i, gc->reg_base + AT91_AIC_SVR(i));
+}
+
+static int aic_irq_domain_xlate(struct irq_domain *d,
+ struct device_node *ctrlr,
+ const u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq,
+ unsigned int *out_type)
+{
+ struct irq_domain_chip_generic *dgc = d->gc;
+ struct irq_chip_generic *gc;
+ unsigned smr;
+ int idx;
+ int ret;
+
+ if (!dgc)
+ return -EINVAL;
+
+ ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize,
+ out_hwirq, out_type);
+ if (ret)
+ return ret;
+
+ idx = intspec[0] / dgc->irqs_per_chip;
+ if (idx >= dgc->num_chips)
+ return -EINVAL;
+
+ gc = dgc->gc[idx];
+
+ irq_gc_lock(gc);
+ smr = irq_reg_readl(gc->reg_base + AT91_AIC_SMR(*out_hwirq));
+ ret = aic_common_set_priority(intspec[2], &smr);
+ if (!ret)
+ irq_reg_writel(smr, gc->reg_base + AT91_AIC_SMR(*out_hwirq));
+ irq_gc_unlock(gc);
+
+ return ret;
+}
+
+static const struct irq_domain_ops aic_irq_ops = {
+ .map = irq_map_generic_chip,
+ .xlate = aic_irq_domain_xlate,
+};
+
+static int __init aic_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ struct irq_chip_generic *gc;
+ struct irq_domain *domain;
+
+ if (aic_domain)
+ return -EEXIST;
+
+ domain = aic_common_of_init(node, &aic_irq_ops, "atmel-aic",
+ NR_AIC_IRQS);
+ if (IS_ERR(domain))
+ return PTR_ERR(domain);
+
+ aic_domain = domain;
+ gc = irq_get_domain_generic_chip(domain, 0);
+
+ gc->chip_types[0].regs.eoi = AT91_AIC_EOICR;
+ gc->chip_types[0].regs.enable = AT91_AIC_IECR;
+ gc->chip_types[0].regs.disable = AT91_AIC_IDCR;
+ gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
+ gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
+ gc->chip_types[0].chip.irq_retrigger = aic_retrigger;
+ gc->chip_types[0].chip.irq_set_type = aic_set_type;
+ gc->chip_types[0].chip.irq_suspend = aic_suspend;
+ gc->chip_types[0].chip.irq_resume = aic_resume;
+ gc->chip_types[0].chip.irq_pm_shutdown = aic_pm_shutdown;
+
+ aic_hw_init(domain);
+ set_handle_irq(aic_handle);
+
+ return 0;
+}
+IRQCHIP_DECLARE(at91rm9200_aic, "atmel,at91rm9200-aic", aic_of_init);